Views messes up Add to Cart Forms

Hello,

I've build a view listing products. Every product has its own Add to Cart Form. You can choose from different attributes and put the product into the cart. This works fine when I test it in the Views Preview.

If I go to the Frontend, there is some weird behaviour.

If I choose an attribute I get the error "An illegal choice has been detected. Please contact the site administrator." then the View messes everything up. The product I wanted to order now has completely different attributes and if I put it to the cart, a completely different product is added to the cart.

If you need more specific information, please ask.